*{
    margin: 0;
    padding: 0;
}

body{
    background-color: gainsboro;
}

header{
    height: 70px;
    line-height: 80px;
    background-color: black;
    color: white;
    padding: 10px;
}

header h1{
    float: left;
}

header p{
    float: right;
    margin-right: 40px;
}

header a{
    float: right;
    text-decoration: none;
    color: orange;
}

header .touxinang{
    float: right;
    width: 55px;
    height: 55px;
    margin-top: 7px;
    margin-right: 10px;
    border-radius: 50%;
    overflow: hidden;
}

aside{
    float: left;
    width: 20%;
    height: 520px;
    border: 1px solid gray;
    background-color: orange;
}
aside ul li{
    height: 40px;
    line-height: 40px;
}

aside ul li a{
    color: white;
    padding-left: 10px;
    text-decoration: none;
}

article{
    float: right;
    width: 79%;
}

article iframe{
    width: 100%;
    height: 520px;
    border: 0px;
}

footer{
    text-align: center;
    clear: both;
    margin-top: 40px;
    border-top: 1px solid gray;
}



